button {
    margin: 0;
    padding: 0;
    border: 0;
}
.demo {
    position: relative;
    width: 325px;
    height: 567px;
    background-color: #fff;
    margin: 10px auto;
    box-shadow: 2px 2px 2px rgba(0, 0, 0, .2);
    border: 1px solid #e2e2e3;
}
.w {
    margin: 0 auto;
}
/* main start */
.main {
    padding-top: 65px;
}
.logo {
    display: block;
    margin-bottom: 10px;
}
.add-btn {
    display: block;
    width: 196px;
    height: 35px;
    background-color: #41b883;
    border-radius: 5px;
    font-size: 12px;
    font-weight: 700;
    color: #fff;
}
.input-box {
    padding-left: 47px;
}
.name-form {
    width: 175px;
    height: 37px;
    border: 1px solid #8f9193;    
}
.submit-btn {
    width: 52px;
    height: 37px;
    background-color: #41b883;
    border-radius: 5px;
    color: #fff;
    font-weight: 700;
}
table {
    width: 100%;
}
table th, td {
    width: 50%;
    text-align: center;
}
/* main end */
nav {
    position: absolute;
    bottom: 0;
    width: 100%;
    font-size: 0;
}
nav button {
    width: 162.5px;
    height: 36px;    
    font-size: 12px;
}
.active{
    background-color: #d3d3d3;
    color: #51b68b;
}
